Add option to set initial In-Reply-To/References

Add the --in-reply-to option to provide a Message-Id for an initial
In-Reply-To/References header, useful for including a new patch series as part
of an existing thread.

Signed-off-by: Josh Triplett <josh@freedesktop.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/Documentation/git-format-patch.txt b/Documentation/git-format-patch.txt
index 305bd79154fabea871419ab56b4a6f01f58b6a57..67425dc0359ee9774200e1a2e12913d570117e7c 100644 (file)
--- a/Documentation/git-format-patch.txt
+++ b/Documentation/git-format-patch.txt
@@ -11,6 +11,7 @@ SYNOPSIS
 [verse]
 'git-format-patch' [-n | -k] [-o <dir> | --stdout] [--attach] [--thread]
                   [-s | --signoff] [--diff-options] [--start-number <n>]
+                  [--in-reply-to=Message-Id]
                   <since>[..<until>]
 
 DESCRIPTION
@@ -72,6 +73,11 @@ OPTIONS
        subsequent mails appear as replies to the first.  Also generates
        the Message-Id header to reference.
 
+--in-reply-to=Message-Id::
+       Make the first mail (or all the mails with --no-thread) appear as a
+       reply to the given Message-Id, which avoids breaking threads to
+       provide a new patch series.
+
 CONFIGURATION
 -------------
 You can specify extra mail header lines to be added to each

diff --git a/builtin-log.c b/builtin-log.c
index 6466768051038ac7cbd77deb8c5b5b6e3456fd02..705205331e5259a1dd643517d0d2983b426e1051 100644 (file)
--- a/builtin-log.c
+++ b/builtin-log.c
@@ -249,6 +249,7 @@ int cmd_format_patch(int argc, const char **argv, char **envp)
        int keep_subject = 0;
        int ignore_if_in_upstream = 0;
        int thread = 0;
+       char *in_reply_to = NULL;
        struct diff_options patch_id_opts;
        char *add_signoff = NULL;
        char message_id[1024];
@@ -320,6 +321,14 @@ int cmd_format_patch(int argc, const char **argv, char **envp)
                        ignore_if_in_upstream = 1;
                else if (!strcmp(argv[i], "--thread"))
                        thread = 1;
+               else if (!strncmp(argv[i], "--in-reply-to=", 14))
+                       in_reply_to = argv[i] + 14;
+               else if (!strcmp(argv[i], "--in-reply-to")) {
+                       i++;
+                       if (i == argc)
+                               die("Need a Message-Id for --in-reply-to");
+                       in_reply_to = argv[i];
+               }
                else
                        argv[j++] = argv[i];
        }
@@ -377,6 +386,7 @@ int cmd_format_patch(int argc, const char **argv, char **envp)
        if (numbered)
                rev.total = total + start_number - 1;
        rev.add_signoff = add_signoff;
+       rev.ref_message_id = in_reply_to;
        while (0 <= --nr) {
                int shown;
                commit = list[nr];